Feature #1904: mod_secdownload option to include url GET parameters in md5 - Lighttpd - lighty labs

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Feature #1904

closed

mod_secdownload option to include url GET parameters in md5

Added by mimbert almost 16 years ago. Updated over 7 years ago.

Status:

Fixed

Priority:

Low

Category:

mod_secdownload

Target version:

1.4.46

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Description

I am using lighttpd secure_download to restrict access to multimedia files (images and videos) to registered members to a website. However I needed to include the get parameters in the md5 hash to protect mod_flv_streaming type of URLs (http://someserver.com/some_video.flv?start=1234).

I wrote some code to support this. The string to be hashed is:
<secret><rel-path><timestamp-hex><parameters-string>

where parameters-string is for exemple "start=1234", or "start=1234&id=4321"

The following option can be used in lighttpd config file to activate this behaviour (which is disabled by default):

secdownload.md5-params = "enable"

An exemple of a generated URL:

http://206.125.164.199/dl/884101a561c305c29571d32461257528/499ad324/V12491_full_vp6_1000.flv?start=0&end=30

If a user try to alter the parameters (ie: start=0&end=120) or to remove them, mod_secdownload will return a 403 error.

I included a diff file to that issue report and I would greatly appreciate I you could consider using this patch in a future release.

Thanks!
Mathieu

Files

securedownload.diff (2.49 KB) securedownload.diff

Include URL parameters in URL

mimbert, 2009-02-17 15:20

Related issues 1 (0 open — 1 closed)

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Updated by mimbert almost 16 years ago

File securedownload.diff securedownload.diff added

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Updated by wolpert over 12 years ago

Is there any progress with this patch? Is this known to work? I have the same needs now...

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Updated by mimbert over 12 years ago

Wolpert, I've been using this patch for 3 years now. So if they don't include it in a release, I suggest you use my diff and compile your own version...

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Updated by stbuehler over 12 years ago

Target version set to 1.4.x
Missing in 1.5.x set to No

1.4.x is sort of "stable", so feature requests are not a priority. And if the target version isn't set i don't see them in the roadmap, so they get lost pretty fast :)

The patch itself looks fine apart from one detail: imho the "?" should be part of the md5 too (con->uri.query starts after the "?").

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Updated by mimbert over 12 years ago

Good point. I considered the '?' as a simple separator and did not include it in the signature, so in my opinion the param should only be key1=val1&key2=val2... Furthermore the signing is done in PHP and the $_SERVER['QUERY_STRING'] doesn't include the '?'.

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Updated by wolpert over 12 years ago

I could use either method for the md5 myself. I'd rather keep query params attached to the md5 the way you would a path_info param... but I have no legacy code to work with here. (FWIW, My client usage will be in Java)

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Updated by gstrauss almost 8 years ago

Subject changed from mod_secure_download option to include url GET parameters in md5 to mod_secdownload option to include url GET parameters in md5
Status changed from New to Need Feedback
Priority changed from Normal to Low

Is this feature request still desirable?

In the intervening year, additional algorithms have been added to mod_secdownload which are more tamper resistant than MD5: HMAC-SHA1 and HMAC-SHA256

Even if using MD5, arbitrary validation could be accomplished using a FastCGI authorizer in lieu of mod_secdownload, allowing the creation of the keys to be collocated with the code which validates the keys, instead of trying to extend mod_secdownload in a variety of ways.

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